Hello Erik, I'm not sure if were either big or corporate enough, but let's see:
We at FZI (http://www.fzi.de) use MediaWiki extensively. It is our intranet and links to all other relevant sites. Since we use the Semantic MediaWiki (http://wiki.ontoworld.org) extension, we also use it as our central staff register. Address lists and such are generated automatically by embedded queries. We manage our weekly research meeting, regulations, technical explanations, holidays, travels, ideas, special interest groups, everything. As we are in close contact to the institute at AIFB (http://aifb.uni-karlsruhe.de), that resides at a different location, it's really helpful to have this shared information space.
Our stats: There have been a total of 10,535 page views, and 2,570 page edits since the wiki was setup. That comes to 1.01 average edits per page, and 4.10 views per edit. There are 70 registered users, of which 7 (or 10.00%) are administrators (see Project:Administrators).
Kind regards,
Max Völkel -- Dipl.-Inform. Max Völkel, Universität Karlsruhe / FZI nepomuk.semanticdesktop.org voelkel@fzi.de +49 721 9654-854 www.xam.de
*Second* Workshop on Semantic Wikis: http://semwiki.org/wibke2006